/******************************************************************************
 * Copyright 2023 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/

/**
 * @file
 */

#pragma once
#include <string>
#include <functional>
#include <mutex>
#include <unordered_map>

#include "CivetServer.h"

/**
 * @namespace apollo::dreamview
 * @brief apollo::dreamview
 */
namespace apollo {
namespace dreamview {

/**
 * @class ProtoHandler
 *
 * @brief The ProtoHandler, built on top of CivetHandler, transfer the proto
 * file by http for frontend to parse message.
 */
class ProtoHandler : public CivetHandler {
 public:
  ProtoHandler() {}

  bool handleGet(CivetServer *server, struct mg_connection *conn);
  std::string GenerateETag(const std::string &content);

 private:
  bool FindProtoPath(const std::string file_relative_path, std::string* file_abs_path);
  std::unordered_map<std::string, std::string> content_cache_;
  std::mutex cache_mutex_;
};

}  // namespace dreamview
}  // namespace apollo
